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I put in a new battery and didn't notice the + and - labels were reversed to the old battery. the starter ran backward for about 2 seconds before I realized the problem and shut down.
After reversing the battery terminals, start was normal but the voltage reading in the cockpit is ZERO. I checked the fuses at the volt meter and the voltage regulator but they look fine. Did I fry the voltage regulator? how can I test it?
Rotax 912 80 horse.
  • Re: no voltage indicated in voltmeter

    by » 11 years ago


    Let's hope a few things. Let's hope there is no permanent damage to the sprag on the starter?
    Probably not since the prop didn't engage.
    I would check to make sure all instruments in the panel are operational. I have seen people blow fuses and ruin radios & transponders. You can check the reg/rec and the how to is in the Heavy Maint. Manual. You can check AC voltage in and check DC voltage out. You can double check voltage at the battery and ignition switch. Check the voltage on the wires into your voltage gauge. Re-check the fuses with an ohm meter first.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


    Thank you said by: jay white

  • Re: no voltage indicated in voltmeter

    by » 11 years ago


    Ok, Im closing this one. the Voltmeter in the plane is fine. the leads to it were rerouted during the instrument panel install. the positive lead was too short to go to the positive post and the negative lead could reach both. I assumed (bad) that the leads were the length required to get to their respective posts, that error caused me to hook up the instrument backwards. The problem has been solved and the gauge works flawlessly. i on the other hand have a new 200 dollar voltage regulator rectifier, a ton of troubleshooting experience and a slightly used multimeter. :lol:

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